申論題

6. Consider a modified form of Couette flow in which there are two immiscible fluids sandwiched between two infinitely long and wide, parallel flat plates. The flow is steady, incompressible, parallel, and Iaminar. The top plate moves at velocity V to the right, and the bottom plate is stationary. Gravity acts in the -z direction (downward), There is no forced pressure gradient pushing the fluids through the channel-the flow is set up solely by viscous effects created by the moving upper plate. You may ignore surface tension effects and assume that the interface is horizontal. The pressure at the bottom of the flow (z = 0) is equal to P₀.